JavaScript: Generate an array, containing the Fibonacci sequence, up until the nth term
JavaScript fundamental (ES6 Syntax): Exercise-237 with Solution
Write a JavaScript program to generate an array, containing the Fibonacci sequence, up until the nth term.
- Use Array.from() to create an empty array of the specific length, initializing the first two values (0 and 1).
- Use Array.prototype.reduce() and Array.prototype.concat() to add values into the array, using the sum of the last two values, except for the first two.
Sample Solution:
JavaScript Code:
//#Source https://bit.ly/2neWfJ2
const fibonacci = n =>
Array.from({ length: n }).reduce(
(acc, val, i) => acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i),
[]
);
console.log(fibonacci(2));
console.log(fibonacci(3));
console.log(fibonacci(6));
Sample Output:
[0,1] [0,1,1] [0,1,1,2,3,5]
Flowchart:

Live Demo:
See the Pen javascript-basic-exercise-237-1 by w3resource (@w3resource) on CodePen.
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Previous: Write a JavaScript program to get the first key that satisfies the provided testing function. Otherwise return undefined.
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JavaScript: Tips of the Day
Creates an object composed of the properties the given function returns truthy for. The function is invoked with two arguments: (value, key)
Example:
const tips_composed = (obj, fn) => Object.keys(obj) .filter(k => fn(obj[k], k)) .reduce((acc, key) => ((acc[key] = obj[key]), acc), {}); console.log(tips_composed({ p: 2, q: '4', r: 6 }, x => typeof x === 'number'));
Output:
[object Object] { p: 2, r: 6 }
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